Cant masturbate with my fingers😕

Summer •
For some odd reason, me "fingering" myself does not get me off. The only thing that gets me to oragasm is when I press my thighs together. This is an issue for me because I have no idea how my boyfriend can replicate it. And I feel stupid because I can't masturbate with my fingers, and I know that's what girls are suppose to do. I don't know how too! Anybody have tips for me?